Platform Engineer

We are seeking an Advanced Network Engineer to enhance and operate an enterprise Zero Trust network environment built on Zscaler (ZIA/ZPA) and Aruba (Clear Pass, switching, wireless) technologies.

With the core architecture already in place, this role focuses on

• Maximising uptime and service reliability
• Driving automation and operational efficiency
• Improving customer experience and network performance
• Building observability and self-healing capabilities

You will be responsible for evolving the network from a functional platform into a highly resilient, intelligent, and low-touch service.

Main duties and responsibilities

• Service Reliability & Uptime
• Own and improve network service availability across global sites
• Proactively identify and eliminate single points of failure
• ISP performance and failover behaviour
• Zscaler traffic paths and resilience
• LAN/WLAN stability (Aruba)
• Lead root cause analysis for recurring issues and implement permanent fixes
• Operate and continuously improve existing ZIA/ZPA deployments

• Tune and maintain

• Access policies
• Traffic forwarding (Client Connector, Branch Connector)
• Application segmentation (ZPA)
• Improve user experience and performance through data-driven optimisation
• Act as escalation point for complex Zscaler-related issues
• Aruba & Clear Pass Operations

• Manage and optimise Aruba Clear Pass NAC environment

• 802.1X authentication (wired/wireless)
• Device onboarding and profiling
• Policy enforcement improvements

• Enhance reliability of

• Campus switching and wireless networks
• Office network standard builds
• Drive consistency and reduce operational complexity across locations
• Automation & Engineering Efficiency

• Reduce manual effort by developing automation using

• Python
• REST APIs (Zscaler, Aruba, Azure, monitoring tools)

• Automate

• Configuration changes
• Policy updates
• User/device onboarding workflows
• Incident response actions
• Introduce Infrastructure as Code principles where applicable
• Observability & Insight
• Design and improve end-to-end observability of network services

• Integrate telemetry from

• Zscaler platforms
• Aruba infrastructure
• ISP and branch connectivity

• Enhance monitoring platforms to provide

• Actionable alerts (reduce noise)
• Service-level dashboards
• User experience visibility
• Use data to drive proactive improvements rather than reactive fixes
• Self-Healing & Proactive Operations

• Implement self-healing capabilities, including

• Automated failover validation
• Scripted remediation of common faults
• Event-driven automation workflows

• Build closed-loop processes

• Detect → Diagnose → Resolve → Validate
• Reduce MTTR and incident volumes through automation
• Customer Experience & Service Improvement
• Focus on end-user experience as a primary success metric

• Partner with Service Desk and L2 teams to

• Improve first-time fix rates
• Reduce escalations
• Simplify support models
• Translate technical improvements into measurable user outcomes

About you

Technical Expertise

• Strong operational experience with

• Zscaler ZIA & ZPA
• Aruba networking (Clear Pass, switching, wireless)
• Experience supporting enterprise-scale, multi-site networks

• Deep understanding of

• Network resilience and failover design
• Identity-based access (802.1X, NAC)
• End-user connectivity troubleshooting
• Automation & Development
• Proficiency in Python scripting
• Hands‑on experience with REST API integrations
• Experience improving operational efficiency through automation

• Familiarity with

• Git / version control
• Automation tooling (Desirable: Ansible, Terraform)
• Observability & Monitoring
• Strong experience with monitoring/observability tools (e. g., Zabbix, Grafana, Splunk)
• Ability to define meaningful SLIs/SLOs and alerting strategies
• Data‑driven approach to performance and reliability improvement
• Soft Skills
• Strong focus on customer experience and service quality
• Analytical, problem‑solving mindset
• Ability to simplify complex issues for non‑technical stakeholders
• Structured, documentation‑led approach
• Continuous improvement and ownership mentality

• Experience with

• Zscaler Branch Connector
• Azure networking and identity integration
• SASE / SSE environments
• Understanding of ITIL service management frameworks
• Exposure to self‑healing or AIOps concepts
• Foundational understanding of Agile methodologies
• Why Join
• Drive the evolution from operational network to intelligent service platform
• Deliver measurable improvements in user experience and reliability
• Work with modern SASE, NAC, and automation technologies
• Influence global service standards and operational practices
• London, United Kingdom Leeds, United Kingdom
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